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    Wear resistant PTFE thin film enabled by a polydopamine adhesive layer

    Year: 2014

    Journal: APPLIED SURFACE SCIENCE, Vol. 292, p 350-356, 20150722

    Authors: Beckford, Samuel; Zou, Min

    Organizations: Univ Arkansas, Microelect Photon Grad Program, Fayetteville, AR 72701 USA; Univ Arkansas, Dept Mech Engn, Fayetteville, AR 72701 USA; Univ Arkansas, Inst Nanosci & Engn, Fayetteville, AR 72701 USA

    The influence of a polydopamine (PDA) adhesive layer on the friction and wear resistance of polytetrafluoroethylene (PTFE) thin films coated on stainless steel was investigated. The friction and wear tests were carried out using a ball on flat configuration under a normal load of 50 g, sliding speed of 2.5 mm/s, and stroke length of 15 mm. It is found that the PDA/PTFE film is able to withstand approximately 500 times more rubbing cycles than the PTFE film alone. X-ray photoelectron spectroscopy (XPS) results show that a tenacious layer of PTFE remains adhered to the PDA layer, which enables the durability of the PDA/PTFE film. Because of the relatively low thickness of the film, PDA/PTFE shows great potential for use in applications where durable, thin films are desirable. (C) 2013 Elsevier B.V. All rights reserved.